Transmission



H. A. MILLER TRANSMISSION Oef. 12, 1937.*

Filed March 12, 1935 2 sheetssheet 1 w|w Y w u# INVENTOR affy Mii/efATTORNEYS H. A) MILLER TRANSMISSION u oct. L12, "1937.

'led March `12; 1935 2 sheeis-sneet'z v lNvl-:NToR @ffy A? Mil/ffATTORNEYS Nnsu PATENToFFlcsd y si "".TRANS'NHSSIQN I l y l g; A.:`M`il`l`elf`,NewxforkrnY.,,assignor, Y

t llllymesne assignments, to H. A. Millerv Engineerl ingCorporation,afcorporation of NewYork u Appnoatioo Moroliz,islaseriaim4095921 olaliiixff3(C 1.?19,2451) y l struc'tu allyirnprovedjgtransmission` and I rnnre` l andi which' exten'dsjfbeyon'dcasingj -II and" v "yespeciallyfalhydraulie tranfsrnvission.f` t n nthrough'bearingmll This `"shaftis"couple d"to'a y lItisanfobjectwoftheinvention;toprovidelan driveshaft `I3rotatablyfsupportedby bearings"u t "5v apparatus of this naturewhicnfrnay be rutilized I4 andlif as illustrated the transmission is tobe in `anynumber ofdifferent associations andjby employed in connectionwith a propeller drivel` rreansof whichf' driven `rnernberniaybelcoupled this drive `shaft maybeenclosed vvith'in a spinnertoadrivingmember,injsuchniainner thatgajvirlo r"n`ose"` casing I5Q"l y n*n u `tually;` infinite ratifbf driyebetween `the memf 'p Secured to theforward end of the drive shaft,` n borsxis'foosioi; y i ashesboen'showninj Fig. 331s agoarlswmohis 1o w A furtherlobject"ofthe.inverition'isy thatfoif enclosed within a'casing I] having extensionsor g proyidi' aihydraulic` transmission involving reifcornnaigtments;j`I8 adjacent `its ends.` Housed "atively few parts]eaehfindividually`'rugged`@and ,withinf theflatter" j compartments are gears IQsimplefin* construction andwhich parts inaybe" which as shown rnayihavea relativelyreduced p providedto furnish aunitary Structure,operating; idiameter and theteeth of which mesh with the l5 over 4long periods of`time t eedorn "frorn teeth ofggear I 'The casing `I'I`-,I`8` fits`close' yldiiculties",` p `i p Y ,jg lvagfainst thesegears so thattherewill be`sub` Still another objectfis""thatfof `fprpviding astantially no space between" the side faces" of` 9*transmission'unit`which 'will embody a`cont`o1"" the laifter'.I andthe inner easingvfaces," it being "F to lbeloizierat innaveryfsi'rnple, In ner either!understood thatmone of these faces `rnrayl includel fbylthe"personincharge" of Athe app ratus. or` by the cover portion :2Q as` hasbeen shown `in Fig- I "any "proper automatik: lfforrnfoff meelianislml"ur'es' 1 fand 2." While inthe; "embodiinentl villus-t.

n n Moreoverby means ofthiswkcontrolfthe 'ratiogof tratedfno packinghor`washers have" 'beenshowm "ifdriveI between" the"`driving"anddrivennineniloers` it will` be appreciated `thattheyfniightbe proa" rnay becontrolled with .nicetyfand lthe t'ransrriit-I vided if`de`sired but ,in any `event the cover 2n HP\tingappar`uswillbeofgsuehinature thattherev n is secured in position 'againstanyfvpossibilityfof rinoumiiofleakage asioof displacement, a"sfor iexample" by bo1ts"2I, arid theentirelcasingissecuredto `thespinner I5gbyp n' "t n nieansof bolts `22 orotherwiseQ- it beingaplnreg'` `130:`With4lnthesef1and other. objects `in rnind cialt'ed that any desirablenumber of coupling 30 orioo is hadto thefsi,` aoneosjneotsiof"drawingspointsmay be nrovidedbetwen theseparts; al-- l l `illustratingpracticalernbo'diinentso'fthefinven` though `only` twolpoits of coupling havebeen;

tom'and inwhich y illustrated. p l A f jrfig. :1j isfla sectiona idoviewofthltransmisfll The gears; were preferablymounted for `r`o 'sijgsn`mpracedf "thin the` fn'sgi nfmn'faii- `tation with'respect to thecasingupon Shafts ,23, `propellersse'rnlolyg` j" fitbeinggnotedthat"baringsiuinay be interposed l nJFig;2""1`aftransversesectionalviewtakn along between theseparts." These`shafts `include the `lies.2*i` and@` the directionpof theualrrows lhead portions n at: one end, andfrrlay haYeQt-hit g l`as"`io`dioatodin1ig t. y V1, Opposite ends "ScrewA-threadedforsuitable-`eng f "y roll `Figfa 11s,@iirtnor,transverseseotionalgyieweasement `with recesses 10r- `openings ,fgrmedlinl 4o taken alongtheiineosand in the" direction the overpwl .lutins/manneralcomnactassemoffthoarroivs asiridiootodioniggi;@of 1 l biyis provided, non willbe understood that ift Fig. f4 is a fragmentary sectional l, plan n theslielllis held `innxed position; the drive `taken along the 1in`e`sf4-4`and inthe direction` `shaftI"3Arnaybe freely rotated-and this willre-`of thearrowsasindicated in Fig.1` f sult merely in the gear I6 beingcorrespondingly 45 In "these drawings the invention has been il-v lrotated to freely drive without any effective driv `lustrated inspecialassociations. As will here-V resulting. p inafte'r be apparent,the uses of therinvention are Now with a view to securing such a drive,it l f manifold, and af transmission embodying the will be observed thatas shown `the cover may be t present invention might be variously`employed; formed with pairsof ports 25--26 and 21-28. (.50 t and thestructure-#if ,necessary-modified aclp` The ports of each vpair aredisposed one to each 1cording to the particular needs of any instal1a`side ofthe zones of engagementof the gears llil C tion. 7 v andIB. Thecover 1s enlarged and bored so that I Thus referring to Figs. to `4, itwill be noted the "ports 25 to 28 may be continued in the form y *ff nthat thenurneral I0 `indicates what maybe the of inwardly extendingpassages 29. Obviously the 55` outer end of these passages may be cappedas at 30, so that a properly sealed system is provided. The cover is, ofcourse, formed with an opening, so that the driving shaft I3 may passtherethrough. This opening is of sufficient area to slidably accommodatea valve member which is in the nature of a sleeve 3I concentricallydisposed with reference to the shaft I3 and which in its projectedposition (as shown in Figures 1 and 4) seals the inner ends of thepassages 29 to thus prevent any circulation of fluid from one passage tothe other. The cover may likewise be formed with a recess within whichmay be disposed a suitable packing assembly 32, in engagement with theexterior face of the sleeve or valve 3 I, so that leakage at this pointwill be reduced to a minimum.

As a consequence of this construction it will be understood that if thecasing portions I'I-I3 Y are filled with a suitable uid, as for exampleoil, and if the parts are in the positions illustrated, a rotation ofthe drive shaft I3 will result in a corresponding movement on the partof the. gear I6 which, as aforebrought out, will tend to cause rotationof the gears I9. However, assum.- ing that the gear I6, as shown in Fig.3, is movingl in a clockwise direction, thefluid will tend to beimpelled by the gears I9 and flow, for example, from the I'ports 26 and21 towards the ports 25 and 28 respectively. With thel valve 3iprojected, no fluid may escape from these ports. Consequently, with thefluid unable to bodily ilow past the engagement zone of the teeth I6 andI9, these gears are, in effect, locked against rotation with respect toeach other, and it is thus clear that a rotation of the gear I6 willresult in a rotation of the casing I1 with the gears I9remainingsubstantially stationary with respect to their shafts 23. Thus,the spinner I or other part coupled to the casingY will becorrespondingly moved to drive any mechanism associated therewith.

If, however, the sleeve or valve 3I is retracted to partially uncoverthe inner Aends of passages 29, it will be apparent that the gears I9may rotate with respect to the gear I6 as the latterfis driven, suchrotation being dependent upon the fluidity of the liquid employed andmore especially uponthe degree to which it may escape from ports 25 and28 and reenter the casing through ports 26 and 21 respectively. Thiswill, of course, depend upon the degree to which the valve or sleeve 3|has been shifted, and it is obvious that if the valve has been fullyretracted, and if the ports are of adequate area, the shaft I3 may berotated as desired without transmitting any driving force to the spinnerI5 (other than would naturally result from frictional engagement of theparts).

Now with a view to controlling the shifting of the valve, it will beobserved that any suitable mechanism might be employed. 'For example,the

sleeve 3| may present flange portions 33 engaged by pins 34 forming apart of yoke 35. lThe latter is pivotally mounted as at 36, and iscontinued beyond this point of mounting in the form of a with the teethof gears I9.

lever 31 which may be coupled to a control (not shown) so that thesleeve may readily be shifted. 'I'hus by simply shifting the lever 31,the propeller or other part connected to the spinner or its equivalentmay be driven at any desired speed up to a speed equal to that of theshaft I3.

While the transmission thus provided may comprise a completely sealedassembly, it is desirable that provision be made for constantly couplingthis assembly with a supply of reserve fluid so that in the eventleakage 4doesl occur such leakage may be compensated for. With this inmind the drive I3 is preferably formed with a .bore 38whic/h is coupledto, for example, the oil pump of the" motor in any desired manner (notshown) The bore 36 communicates with passages 39 and the cover 20 isformed with an annular groove 40 registering with the end of thesepassages and in turn communicating with W passages 4I which preferablyterminate at the inner faces of the casing and in line with the zone oftravel of the teeth of gear I6 and intermediate the zones of engagementof these teeth Due to this construction it will be apparent that whileoil or other liquid within the bore 28 will be under pressure,v thispressure will not have to be s0 great as to/overcome the pressuresexisting within the operating parts of the transmission. Also, therewill be no4 danger of the liquid within the latter tending to escapethrough passages 3| into' .of oil or other liquid from thetransmissionwill be extremely negligible, this being particularly true due to thepacking 32 and/or other packing which may be employed.

Thus, among others, the several objects of the invention as aforenotedare achieved. It will be appreciated, as aforebrought out, that any number of changes in construction and rearrangement of the parts might beresorted to without departing from the spirit of the invention asdeilnedv by theiclaim.

Having thus fully described the invention, what is claimed is.: l

A transmission including a driving shaft, a gear secured` to said shaft,further gears having their teeth in mesh with said first named gear, acasing rotatably mounting said further gears and enclosing said firstnamed gear, said casing being formed with passagesfhaving their innerends extending in advance and to the rear of the zones in'which theteeth of said gears mesh, the bodies of said passages extendingrearwardly and inwardly towards the facelof the gear-mounting shaft andterminating at a point spaced from the face of said shaft, a valve'shiftable to a position between said shaft and thevlatter ends of saidpassages to close the same, said casing being formed with furtherpassages communicating with the space within which said further gearsare disposed, and said shaft being formed with a fluid transmitting boreconnected to said last named casing passages.

f HARRY A. MILLER.

